Air filter device



FIG. 1 is a front elevational view of my air filter device;

FIG. 2 is a rear elevational view;

FIG. 3 is left side elevational view;

FIG. 4 is a right side elevational view;

FIG. 5 is an enlarged top plan view; and,

FIG. 6 is an enlarged bottom plan view.

I claim the ornamental design for an air filter device, as shown.